Unmanned aircraft



FIG. 1 is a top plan view of an unmanned aircraft showing our new design;

FIG. 2 is a bottom plan view of FIG. 1;

FIG. 3 is a first perspective view of FIG. 1;

FIG. 4 is a second perspective view of FIG. 1;

FIG. 5 is a third perspective view of FIG. 1 in a use state; and,

FIG. 6 is a fourth perspective view of FIG. 1 in a use state.

The broken lines shown in the drawings represent portions of the unmanned aircraft which form no part of the claimed design. 

CLAIM The ornamental design for an unmanned aircraft, as shown and described. 